1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008-2010 Edward Tomasz Napierała <trasz@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 /* 30 * ACL support routines specific to NFSv4 access control lists. These are 31 * utility routines for code common across file systems implementing NFSv4 32 * ACLs. 33 */ 34 35 #ifdef _KERNEL 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/systm.h> 43 #include <sys/mount.h> 44 #include <sys/priv.h> 45 #include <sys/vnode.h> 46 #include <sys/errno.h> 47 #include <sys/stat.h> 48 #include <sys/sysctl.h> 49 #include <sys/acl.h> 50 #else 51 #include <errno.h> 52 #include <assert.h> 53 #include <sys/acl.h> 54 #include <sys/stat.h> 55 #define KASSERT(a, b) assert(a) 56 #define CTASSERT(a) 57 58 #endif /* !_KERNEL */ 59 60 #ifdef _KERNEL 61 62 static void acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode); 63 64 static int acl_nfs4_old_semantics = 0; 65 66 SYSCTL_INT(_vfs, OID_AUTO, acl_nfs4_old_semantics, CTLFLAG_RW, 67 &acl_nfs4_old_semantics, 0, "Use pre-PSARC/2010/029 NFSv4 ACL semantics"); 68 69 static struct { 70 accmode_t accmode; 71 int mask; 72 } accmode2mask[] = {{VREAD, ACL_READ_DATA}, 73 {VWRITE, ACL_WRITE_DATA}, 74 {VAPPEND, ACL_APPEND_DATA}, 75 {VEXEC, ACL_EXECUTE}, 76 {VREAD_NAMED_ATTRS, ACL_READ_NAMED_ATTRS}, 77 {VWRITE_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS}, 78 {VDELETE_CHILD, ACL_DELETE_CHILD}, 79 {VREAD_ATTRIBUTES, ACL_READ_ATTRIBUTES}, 80 {VWRITE_ATTRIBUTES, ACL_WRITE_ATTRIBUTES}, 81 {VDELETE, ACL_DELETE}, 82 {VREAD_ACL, ACL_READ_ACL}, 83 {VWRITE_ACL, ACL_WRITE_ACL}, 84 {VWRITE_OWNER, ACL_WRITE_OWNER}, 85 {VSYNCHRONIZE, ACL_SYNCHRONIZE}, 86 {0, 0}}; 87 88 static int 89 _access_mask_from_accmode(accmode_t accmode) 90 { 91 int access_mask = 0, i; 92 93 for (i = 0; accmode2mask[i].accmode != 0; i++) { 94 if (accmode & accmode2mask[i].accmode) 95 access_mask |= accmode2mask[i].mask; 96 } 97 98 /* 99 * VAPPEND is just a modifier for VWRITE; if the caller asked 100 * for 'VAPPEND | VWRITE', we want to check for ACL_APPEND_DATA only. 101 */ 102 if (access_mask & ACL_APPEND_DATA) 103 access_mask &= ~ACL_WRITE_DATA; 104 105 return (access_mask); 106 } 107 108 /* 109 * Return 0, iff access is allowed, 1 otherwise. 110 */ 111 static int 112 _acl_denies(const struct acl *aclp, int access_mask, struct ucred *cred, 113 int file_uid, int file_gid, int *denied_explicitly) 114 { 115 int i; 116 const struct acl_entry *entry; 117 118 if (denied_explicitly != NULL) 119 *denied_explicitly = 0; 120 121 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 122 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 123 124 for (i = 0; i < aclp->acl_cnt; i++) { 125 entry = &(aclp->acl_entry[i]); 126 127 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 128 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 129 continue; 130 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 131 continue; 132 switch (entry->ae_tag) { 133 case ACL_USER_OBJ: 134 if (file_uid != cred->cr_uid) 135 continue; 136 break; 137 case ACL_USER: 138 if (entry->ae_id != cred->cr_uid) 139 continue; 140 break; 141 case ACL_GROUP_OBJ: 142 if (!groupmember(file_gid, cred)) 143 continue; 144 break; 145 case ACL_GROUP: 146 if (!groupmember(entry->ae_id, cred)) 147 continue; 148 break; 149 default: 150 KASSERT(entry->ae_tag == ACL_EVERYONE, 151 ("entry->ae_tag == ACL_EVERYONE")); 152 } 153 154 if (entry->ae_entry_type == ACL_ENTRY_TYPE_DENY) { 155 if (entry->ae_perm & access_mask) { 156 if (denied_explicitly != NULL) 157 *denied_explicitly = 1; 158 return (1); 159 } 160 } 161 162 access_mask &= ~(entry->ae_perm); 163 if (access_mask == 0) 164 return (0); 165 } 166 167 if (access_mask == 0) 168 return (0); 169 170 return (1); 171 } 172 173 int 174 vaccess_acl_nfs4(enum vtype type, uid_t file_uid, gid_t file_gid, 175 struct acl *aclp, accmode_t accmode, struct ucred *cred, int *privused) 176 { 177 accmode_t priv_granted = 0; 178 int denied, explicitly_denied, access_mask, is_directory, 179 must_be_owner = 0; 180 mode_t file_mode = 0; 181 182 KASSERT((accmode & ~(VEXEC | VWRITE | VREAD | VADMIN | VAPPEND | 183 VEXPLICIT_DENY | VREAD_NAMED_ATTRS | VWRITE_NAMED_ATTRS | 184 VDELETE_CHILD | VREAD_ATTRIBUTES | VWRITE_ATTRIBUTES | VDELETE | 185 VREAD_ACL | VWRITE_ACL | VWRITE_OWNER | VSYNCHRONIZE)) == 0, 186 ("invalid bit in accmode")); 187 KASSERT((accmode & VAPPEND) == 0 || (accmode & VWRITE), 188 ("VAPPEND without VWRITE")); 189 190 if (privused != NULL) 191 *privused = 0; 192 193 if (accmode & VADMIN) 194 must_be_owner = 1; 195 196 /* 197 * Ignore VSYNCHRONIZE permission. 198 */ 199 accmode &= ~VSYNCHRONIZE; 200 201 access_mask = _access_mask_from_accmode(accmode); 202 203 if (type == VDIR) 204 is_directory = 1; 205 else 206 is_directory = 0; 207 208 /* 209 * File owner is always allowed to read and write the ACL 210 * and basic attributes. This is to prevent a situation 211 * where user would change ACL in a way that prevents him 212 * from undoing the change. 213 */ 214 if (file_uid == cred->cr_uid) 215 access_mask &= ~(ACL_READ_ACL | ACL_WRITE_ACL | 216 ACL_READ_ATTRIBUTES | ACL_WRITE_ATTRIBUTES); 217 218 /* 219 * Ignore append permission for regular files; use write 220 * permission instead. 221 */ 222 if (!is_directory && (access_mask & ACL_APPEND_DATA)) { 223 access_mask &= ~ACL_APPEND_DATA; 224 access_mask |= ACL_WRITE_DATA; 225 } 226 227 denied = _acl_denies(aclp, access_mask, cred, file_uid, file_gid, 228 &explicitly_denied); 229 230 if (must_be_owner) { 231 if (file_uid != cred->cr_uid) 232 denied = EPERM; 233 } 234 235 /* 236 * For VEXEC, ensure that at least one execute bit is set for 237 * non-directories. We have to check the mode here to stay 238 * consistent with execve(2). See the test in 239 * exec_check_permissions(). 240 */ 241 acl_nfs4_sync_mode_from_acl(&file_mode, aclp); 242 if (!denied && !is_directory && (accmode & VEXEC) && 243 (file_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) == 0) 244 denied = EACCES; 245 246 if (!denied) 247 return (0); 248 249 /* 250 * Access failed. Iff it was not denied explicitly and 251 * VEXPLICIT_DENY flag was specified, allow access. 252 */ 253 if ((accmode & VEXPLICIT_DENY) && explicitly_denied == 0) 254 return (0); 255 256 accmode &= ~VEXPLICIT_DENY; 257 258 /* 259 * No match. Try to use privileges, if there are any. 260 */ 261 if (is_directory) { 262 if ((accmode & VEXEC) && !priv_check_cred(cred, PRIV_VFS_LOOKUP)) 263 priv_granted |= VEXEC; 264 } else { 265 /* 266 * Ensure that at least one execute bit is on. Otherwise, 267 * a privileged user will always succeed, and we don't want 268 * this to happen unless the file really is executable. 269 */ 270 if ((accmode & VEXEC) && (file_mode & 271 (S_IXUSR | S_IXGRP | S_IXOTH)) != 0 && 272 !priv_check_cred(cred, PRIV_VFS_EXEC)) 273 priv_granted |= VEXEC; 274 } 275 276 if ((accmode & VREAD) && !priv_check_cred(cred, PRIV_VFS_READ)) 277 priv_granted |= VREAD; 278 279 if ((accmode & (VWRITE | VAPPEND | VDELETE_CHILD)) && 280 !priv_check_cred(cred, PRIV_VFS_WRITE)) 281 priv_granted |= (VWRITE | VAPPEND | VDELETE_CHILD); 282 283 if ((accmode & VADMIN_PERMS) && 284 !priv_check_cred(cred, PRIV_VFS_ADMIN)) 285 priv_granted |= VADMIN_PERMS; 286 287 if ((accmode & VSTAT_PERMS) && 288 !priv_check_cred(cred, PRIV_VFS_STAT)) 289 priv_granted |= VSTAT_PERMS; 290 291 if ((accmode & priv_granted) == accmode) { 292 if (privused != NULL) 293 *privused = 1; 294 295 return (0); 296 } 297 298 if (accmode & (VADMIN_PERMS | VDELETE_CHILD | VDELETE)) 299 denied = EPERM; 300 else 301 denied = EACCES; 302 303 return (denied); 304 } 305 #endif /* _KERNEL */ 306 307 static int 308 _acl_entry_matches(struct acl_entry *entry, acl_tag_t tag, acl_perm_t perm, 309 acl_entry_type_t entry_type) 310 { 311 if (entry->ae_tag != tag) 312 return (0); 313 314 if (entry->ae_id != ACL_UNDEFINED_ID) 315 return (0); 316 317 if (entry->ae_perm != perm) 318 return (0); 319 320 if (entry->ae_entry_type != entry_type) 321 return (0); 322 323 if (entry->ae_flags != 0) 324 return (0); 325 326 return (1); 327 } 328 329 static struct acl_entry * 330 _acl_append(struct acl *aclp, acl_tag_t tag, acl_perm_t perm, 331 acl_entry_type_t entry_type) 332 { 333 struct acl_entry *entry; 334 335 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 336 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 337 338 entry = &(aclp->acl_entry[aclp->acl_cnt]); 339 aclp->acl_cnt++; 340 341 entry->ae_tag = tag; 342 entry->ae_id = ACL_UNDEFINED_ID; 343 entry->ae_perm = perm; 344 entry->ae_entry_type = entry_type; 345 entry->ae_flags = 0; 346 347 return (entry); 348 } 349 350 static struct acl_entry * 351 _acl_duplicate_entry(struct acl *aclp, int entry_index) 352 { 353 int i; 354 355 KASSERT(aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 356 ("aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 357 358 for (i = aclp->acl_cnt; i > entry_index; i--) 359 aclp->acl_entry[i] = aclp->acl_entry[i - 1]; 360 361 aclp->acl_cnt++; 362 363 return (&(aclp->acl_entry[entry_index + 1])); 364 } 365 366 static void 367 acl_nfs4_sync_acl_from_mode_draft(struct acl *aclp, mode_t mode, 368 int file_owner_id) 369 { 370 int i, meets, must_append; 371 struct acl_entry *entry, *copy, *previous, 372 *a1, *a2, *a3, *a4, *a5, *a6; 373 mode_t amode; 374 const int READ = 04; 375 const int WRITE = 02; 376 const int EXEC = 01; 377 378 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 379 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 380 381 /* 382 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 383 * 384 * 3.16.6.3. Applying a Mode to an Existing ACL 385 */ 386 387 /* 388 * 1. For each ACE: 389 */ 390 for (i = 0; i < aclp->acl_cnt; i++) { 391 entry = &(aclp->acl_entry[i]); 392 393 /* 394 * 1.1. If the type is neither ALLOW or DENY - skip. 395 */ 396 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 397 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 398 continue; 399 400 /* 401 * 1.2. If ACL_ENTRY_INHERIT_ONLY is set - skip. 402 */ 403 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 404 continue; 405 406 /* 407 * 1.3. If ACL_ENTRY_FILE_INHERIT or ACL_ENTRY_DIRECTORY_INHERIT 408 * are set: 409 */ 410 if (entry->ae_flags & 411 (ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT)) { 412 /* 413 * 1.3.1. A copy of the current ACE is made, and placed 414 * in the ACL immediately following the current 415 * ACE. 416 */ 417 copy = _acl_duplicate_entry(aclp, i); 418 419 /* 420 * 1.3.2. In the first ACE, the flag 421 * ACL_ENTRY_INHERIT_ONLY is set. 422 */ 423 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 424 425 /* 426 * 1.3.3. In the second ACE, the following flags 427 * are cleared: 428 * ACL_ENTRY_FILE_INHERIT, 429 * ACL_ENTRY_DIRECTORY_INHERIT, 430 * ACL_ENTRY_NO_PROPAGATE_INHERIT. 431 */ 432 copy->ae_flags &= ~(ACL_ENTRY_FILE_INHERIT | 433 ACL_ENTRY_DIRECTORY_INHERIT | 434 ACL_ENTRY_NO_PROPAGATE_INHERIT); 435 436 /* 437 * The algorithm continues on with the second ACE. 438 */ 439 i++; 440 entry = copy; 441 } 442 443 /* 444 * 1.4. If it's owner@, group@ or everyone@ entry, clear 445 * ACL_READ_DATA, ACL_WRITE_DATA, ACL_APPEND_DATA 446 * and ACL_EXECUTE. Continue to the next entry. 447 */ 448 if (entry->ae_tag == ACL_USER_OBJ || 449 entry->ae_tag == ACL_GROUP_OBJ || 450 entry->ae_tag == ACL_EVERYONE) { 451 entry->ae_perm &= ~(ACL_READ_DATA | ACL_WRITE_DATA | 452 ACL_APPEND_DATA | ACL_EXECUTE); 453 continue; 454 } 455 456 /* 457 * 1.5. Otherwise, if the "who" field did not match one 458 * of OWNER@, GROUP@, EVERYONE@: 459 * 460 * 1.5.1. If the type is ALLOW, check the preceding ACE. 461 * If it does not meet all of the following criteria: 462 */ 463 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW) 464 continue; 465 466 meets = 0; 467 if (i > 0) { 468 meets = 1; 469 previous = &(aclp->acl_entry[i - 1]); 470 471 /* 472 * 1.5.1.1. The type field is DENY, 473 */ 474 if (previous->ae_entry_type != ACL_ENTRY_TYPE_DENY) 475 meets = 0; 476 477 /* 478 * 1.5.1.2. The "who" field is the same as the current 479 * ACE, 480 * 481 * 1.5.1.3. The flag bit ACE4_IDENTIFIER_GROUP 482 * is the same as it is in the current ACE, 483 * and no other flag bits are set, 484 */ 485 if (previous->ae_id != entry->ae_id || 486 previous->ae_tag != entry->ae_tag) 487 meets = 0; 488 489 if (previous->ae_flags) 490 meets = 0; 491 492 /* 493 * 1.5.1.4. The mask bits are a subset of the mask bits 494 * of the current ACE, and are also subset of 495 * the following: ACL_READ_DATA, 496 * ACL_WRITE_DATA, ACL_APPEND_DATA, ACL_EXECUTE 497 */ 498 if (previous->ae_perm & ~(entry->ae_perm)) 499 meets = 0; 500 501 if (previous->ae_perm & ~(ACL_READ_DATA | 502 ACL_WRITE_DATA | ACL_APPEND_DATA | ACL_EXECUTE)) 503 meets = 0; 504 } 505 506 if (!meets) { 507 /* 508 * Then the ACE of type DENY, with a who equal 509 * to the current ACE, flag bits equal to 510 * (<current ACE flags> & <ACE_IDENTIFIER_GROUP>) 511 * and no mask bits, is prepended. 512 */ 513 previous = entry; 514 entry = _acl_duplicate_entry(aclp, i); 515 516 /* Adjust counter, as we've just added an entry. */ 517 i++; 518 519 previous->ae_tag = entry->ae_tag; 520 previous->ae_id = entry->ae_id; 521 previous->ae_flags = entry->ae_flags; 522 previous->ae_perm = 0; 523 previous->ae_entry_type = ACL_ENTRY_TYPE_DENY; 524 } 525 526 /* 527 * 1.5.2. The following modifications are made to the prepended 528 * ACE. The intent is to mask the following ACE 529 * to disallow ACL_READ_DATA, ACL_WRITE_DATA, 530 * ACL_APPEND_DATA, or ACL_EXECUTE, based upon the group 531 * permissions of the new mode. As a special case, 532 * if the ACE matches the current owner of the file, 533 * the owner bits are used, rather than the group bits. 534 * This is reflected in the algorithm below. 535 */ 536 amode = mode >> 3; 537 538 /* 539 * If ACE4_IDENTIFIER_GROUP is not set, and the "who" field 540 * in ACE matches the owner of the file, we shift amode three 541 * more bits, in order to have the owner permission bits 542 * placed in the three low order bits of amode. 543 */ 544 if (entry->ae_tag == ACL_USER && entry->ae_id == file_owner_id) 545 amode = amode >> 3; 546 547 if (entry->ae_perm & ACL_READ_DATA) { 548 if (amode & READ) 549 previous->ae_perm &= ~ACL_READ_DATA; 550 else 551 previous->ae_perm |= ACL_READ_DATA; 552 } 553 554 if (entry->ae_perm & ACL_WRITE_DATA) { 555 if (amode & WRITE) 556 previous->ae_perm &= ~ACL_WRITE_DATA; 557 else 558 previous->ae_perm |= ACL_WRITE_DATA; 559 } 560 561 if (entry->ae_perm & ACL_APPEND_DATA) { 562 if (amode & WRITE) 563 previous->ae_perm &= ~ACL_APPEND_DATA; 564 else 565 previous->ae_perm |= ACL_APPEND_DATA; 566 } 567 568 if (entry->ae_perm & ACL_EXECUTE) { 569 if (amode & EXEC) 570 previous->ae_perm &= ~ACL_EXECUTE; 571 else 572 previous->ae_perm |= ACL_EXECUTE; 573 } 574 575 /* 576 * 1.5.3. If ACE4_IDENTIFIER_GROUP is set in the flags 577 * of the ALLOW ace: 578 * 579 * XXX: This point is not there in the Falkner's draft. 580 */ 581 if (entry->ae_tag == ACL_GROUP && 582 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) { 583 mode_t extramode, ownermode; 584 extramode = (mode >> 3) & 07; 585 ownermode = mode >> 6; 586 extramode &= ~ownermode; 587 588 if (extramode) { 589 if (extramode & READ) { 590 entry->ae_perm &= ~ACL_READ_DATA; 591 previous->ae_perm &= ~ACL_READ_DATA; 592 } 593 594 if (extramode & WRITE) { 595 entry->ae_perm &= 596 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 597 previous->ae_perm &= 598 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 599 } 600 601 if (extramode & EXEC) { 602 entry->ae_perm &= ~ACL_EXECUTE; 603 previous->ae_perm &= ~ACL_EXECUTE; 604 } 605 } 606 } 607 } 608 609 /* 610 * 2. If there at least six ACEs, the final six ACEs are examined. 611 * If they are not equal to what we want, append six ACEs. 612 */ 613 must_append = 0; 614 if (aclp->acl_cnt < 6) { 615 must_append = 1; 616 } else { 617 a6 = &(aclp->acl_entry[aclp->acl_cnt - 1]); 618 a5 = &(aclp->acl_entry[aclp->acl_cnt - 2]); 619 a4 = &(aclp->acl_entry[aclp->acl_cnt - 3]); 620 a3 = &(aclp->acl_entry[aclp->acl_cnt - 4]); 621 a2 = &(aclp->acl_entry[aclp->acl_cnt - 5]); 622 a1 = &(aclp->acl_entry[aclp->acl_cnt - 6]); 623 624 if (!_acl_entry_matches(a1, ACL_USER_OBJ, 0, 625 ACL_ENTRY_TYPE_DENY)) 626 must_append = 1; 627 if (!_acl_entry_matches(a2, ACL_USER_OBJ, ACL_WRITE_ACL | 628 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 629 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW)) 630 must_append = 1; 631 if (!_acl_entry_matches(a3, ACL_GROUP_OBJ, 0, 632 ACL_ENTRY_TYPE_DENY)) 633 must_append = 1; 634 if (!_acl_entry_matches(a4, ACL_GROUP_OBJ, 0, 635 ACL_ENTRY_TYPE_ALLOW)) 636 must_append = 1; 637 if (!_acl_entry_matches(a5, ACL_EVERYONE, ACL_WRITE_ACL | 638 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 639 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY)) 640 must_append = 1; 641 if (!_acl_entry_matches(a6, ACL_EVERYONE, ACL_READ_ACL | 642 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 643 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW)) 644 must_append = 1; 645 } 646 647 if (must_append) { 648 KASSERT(aclp->acl_cnt + 6 <= ACL_MAX_ENTRIES, 649 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 650 651 a1 = _acl_append(aclp, ACL_USER_OBJ, 0, ACL_ENTRY_TYPE_DENY); 652 a2 = _acl_append(aclp, ACL_USER_OBJ, ACL_WRITE_ACL | 653 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 654 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_ALLOW); 655 a3 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_DENY); 656 a4 = _acl_append(aclp, ACL_GROUP_OBJ, 0, ACL_ENTRY_TYPE_ALLOW); 657 a5 = _acl_append(aclp, ACL_EVERYONE, ACL_WRITE_ACL | 658 ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 659 ACL_WRITE_NAMED_ATTRS, ACL_ENTRY_TYPE_DENY); 660 a6 = _acl_append(aclp, ACL_EVERYONE, ACL_READ_ACL | 661 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | 662 ACL_SYNCHRONIZE, ACL_ENTRY_TYPE_ALLOW); 663 664 KASSERT(a1 != NULL && a2 != NULL && a3 != NULL && a4 != NULL && 665 a5 != NULL && a6 != NULL, ("couldn't append to ACL.")); 666 } 667 668 /* 669 * 3. The final six ACEs are adjusted according to the incoming mode. 670 */ 671 if (mode & S_IRUSR) 672 a2->ae_perm |= ACL_READ_DATA; 673 else 674 a1->ae_perm |= ACL_READ_DATA; 675 if (mode & S_IWUSR) 676 a2->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 677 else 678 a1->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 679 if (mode & S_IXUSR) 680 a2->ae_perm |= ACL_EXECUTE; 681 else 682 a1->ae_perm |= ACL_EXECUTE; 683 684 if (mode & S_IRGRP) 685 a4->ae_perm |= ACL_READ_DATA; 686 else 687 a3->ae_perm |= ACL_READ_DATA; 688 if (mode & S_IWGRP) 689 a4->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 690 else 691 a3->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 692 if (mode & S_IXGRP) 693 a4->ae_perm |= ACL_EXECUTE; 694 else 695 a3->ae_perm |= ACL_EXECUTE; 696 697 if (mode & S_IROTH) 698 a6->ae_perm |= ACL_READ_DATA; 699 else 700 a5->ae_perm |= ACL_READ_DATA; 701 if (mode & S_IWOTH) 702 a6->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 703 else 704 a5->ae_perm |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 705 if (mode & S_IXOTH) 706 a6->ae_perm |= ACL_EXECUTE; 707 else 708 a5->ae_perm |= ACL_EXECUTE; 709 } 710 711 #ifdef _KERNEL 712 void 713 acl_nfs4_sync_acl_from_mode(struct acl *aclp, mode_t mode, 714 int file_owner_id) 715 { 716 717 if (acl_nfs4_old_semantics) 718 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, file_owner_id); 719 else 720 acl_nfs4_trivial_from_mode(aclp, mode); 721 } 722 #endif /* _KERNEL */ 723 724 void 725 acl_nfs4_sync_mode_from_acl(mode_t *_mode, const struct acl *aclp) 726 { 727 int i; 728 mode_t old_mode = *_mode, mode = 0, seen = 0; 729 const struct acl_entry *entry; 730 731 KASSERT(aclp->acl_cnt <= ACL_MAX_ENTRIES, 732 ("aclp->acl_cnt <= ACL_MAX_ENTRIES")); 733 734 /* 735 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 736 * 737 * 3.16.6.1. Recomputing mode upon SETATTR of ACL 738 */ 739 740 for (i = 0; i < aclp->acl_cnt; i++) { 741 entry = &(aclp->acl_entry[i]); 742 743 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 744 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 745 continue; 746 747 if (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) 748 continue; 749 750 if (entry->ae_tag == ACL_USER_OBJ) { 751 if ((entry->ae_perm & ACL_READ_DATA) && 752 ((seen & S_IRUSR) == 0)) { 753 seen |= S_IRUSR; 754 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 755 mode |= S_IRUSR; 756 } 757 if ((entry->ae_perm & ACL_WRITE_DATA) && 758 ((seen & S_IWUSR) == 0)) { 759 seen |= S_IWUSR; 760 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 761 mode |= S_IWUSR; 762 } 763 if ((entry->ae_perm & ACL_EXECUTE) && 764 ((seen & S_IXUSR) == 0)) { 765 seen |= S_IXUSR; 766 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 767 mode |= S_IXUSR; 768 } 769 } else if (entry->ae_tag == ACL_GROUP_OBJ) { 770 if ((entry->ae_perm & ACL_READ_DATA) && 771 ((seen & S_IRGRP) == 0)) { 772 seen |= S_IRGRP; 773 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 774 mode |= S_IRGRP; 775 } 776 if ((entry->ae_perm & ACL_WRITE_DATA) && 777 ((seen & S_IWGRP) == 0)) { 778 seen |= S_IWGRP; 779 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 780 mode |= S_IWGRP; 781 } 782 if ((entry->ae_perm & ACL_EXECUTE) && 783 ((seen & S_IXGRP) == 0)) { 784 seen |= S_IXGRP; 785 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 786 mode |= S_IXGRP; 787 } 788 } else if (entry->ae_tag == ACL_EVERYONE) { 789 if (entry->ae_perm & ACL_READ_DATA) { 790 if ((seen & S_IRUSR) == 0) { 791 seen |= S_IRUSR; 792 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 793 mode |= S_IRUSR; 794 } 795 if ((seen & S_IRGRP) == 0) { 796 seen |= S_IRGRP; 797 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 798 mode |= S_IRGRP; 799 } 800 if ((seen & S_IROTH) == 0) { 801 seen |= S_IROTH; 802 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 803 mode |= S_IROTH; 804 } 805 } 806 if (entry->ae_perm & ACL_WRITE_DATA) { 807 if ((seen & S_IWUSR) == 0) { 808 seen |= S_IWUSR; 809 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 810 mode |= S_IWUSR; 811 } 812 if ((seen & S_IWGRP) == 0) { 813 seen |= S_IWGRP; 814 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 815 mode |= S_IWGRP; 816 } 817 if ((seen & S_IWOTH) == 0) { 818 seen |= S_IWOTH; 819 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 820 mode |= S_IWOTH; 821 } 822 } 823 if (entry->ae_perm & ACL_EXECUTE) { 824 if ((seen & S_IXUSR) == 0) { 825 seen |= S_IXUSR; 826 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 827 mode |= S_IXUSR; 828 } 829 if ((seen & S_IXGRP) == 0) { 830 seen |= S_IXGRP; 831 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 832 mode |= S_IXGRP; 833 } 834 if ((seen & S_IXOTH) == 0) { 835 seen |= S_IXOTH; 836 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 837 mode |= S_IXOTH; 838 } 839 } 840 } 841 } 842 843 *_mode = mode | (old_mode & ACL_PRESERVE_MASK); 844 } 845 846 #ifdef _KERNEL 847 /* 848 * Calculate inherited ACL in a manner compatible with NFSv4 Minor Version 1, 849 * draft-ietf-nfsv4-minorversion1-03.txt. 850 */ 851 static void 852 acl_nfs4_compute_inherited_acl_draft(const struct acl *parent_aclp, 853 struct acl *child_aclp, mode_t mode, int file_owner_id, 854 int is_directory) 855 { 856 int i, flags; 857 const struct acl_entry *parent_entry; 858 struct acl_entry *entry, *copy; 859 860 KASSERT(child_aclp->acl_cnt == 0, ("child_aclp->acl_cnt == 0")); 861 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 862 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 863 864 /* 865 * NFSv4 Minor Version 1, draft-ietf-nfsv4-minorversion1-03.txt 866 * 867 * 3.16.6.2. Applying the mode given to CREATE or OPEN 868 * to an inherited ACL 869 */ 870 871 /* 872 * 1. Form an ACL that is the concatenation of all inheritable ACEs. 873 */ 874 for (i = 0; i < parent_aclp->acl_cnt; i++) { 875 parent_entry = &(parent_aclp->acl_entry[i]); 876 flags = parent_entry->ae_flags; 877 878 /* 879 * Entry is not inheritable at all. 880 */ 881 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 882 ACL_ENTRY_FILE_INHERIT)) == 0) 883 continue; 884 885 /* 886 * We're creating a file, but entry is not inheritable 887 * by files. 888 */ 889 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 890 continue; 891 892 /* 893 * Entry is inheritable only by files, but has NO_PROPAGATE 894 * flag set, and we're creating a directory, so it wouldn't 895 * propagate to any file in that directory anyway. 896 */ 897 if (is_directory && 898 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 899 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 900 continue; 901 902 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 903 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 904 child_aclp->acl_entry[child_aclp->acl_cnt] = *parent_entry; 905 child_aclp->acl_cnt++; 906 } 907 908 /* 909 * 2. For each entry in the new ACL, adjust its flags, possibly 910 * creating two entries in place of one. 911 */ 912 for (i = 0; i < child_aclp->acl_cnt; i++) { 913 entry = &(child_aclp->acl_entry[i]); 914 915 /* 916 * This is not in the specification, but SunOS 917 * apparently does that. 918 */ 919 if (((entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT) || 920 !is_directory) && 921 entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 922 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 923 924 /* 925 * 2.A. If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if the object 926 * being created is not a directory, then clear the 927 * following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 928 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 929 * ACL_ENTRY_INHERIT_ONLY. 930 */ 931 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 932 !is_directory) { 933 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 934 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 935 ACL_ENTRY_INHERIT_ONLY); 936 937 /* 938 * Continue on to the next ACE. 939 */ 940 continue; 941 } 942 943 /* 944 * 2.B. If the object is a directory and ACL_ENTRY_FILE_INHERIT 945 * is set, but ACL_ENTRY_NO_PROPAGATE_INHERIT is not set, ensure 946 * that ACL_ENTRY_INHERIT_ONLY is set. Continue to the 947 * next ACE. Otherwise... 948 */ 949 /* 950 * XXX: Read it again and make sure what does the "otherwise" 951 * apply to. 952 */ 953 if (is_directory && 954 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 955 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 956 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 957 continue; 958 } 959 960 /* 961 * 2.C. If the type of the ACE is neither ALLOW nor deny, 962 * then continue. 963 */ 964 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 965 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 966 continue; 967 968 /* 969 * 2.D. Copy the original ACE into a second, adjacent ACE. 970 */ 971 copy = _acl_duplicate_entry(child_aclp, i); 972 973 /* 974 * 2.E. On the first ACE, ensure that ACL_ENTRY_INHERIT_ONLY 975 * is set. 976 */ 977 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 978 979 /* 980 * 2.F. On the second ACE, clear the following flags: 981 * ACL_ENTRY_NO_PROPAGATE_INHERIT, ACL_ENTRY_FILE_INHERIT, 982 * ACL_ENTRY_DIRECTORY_INHERIT, ACL_ENTRY_INHERIT_ONLY. 983 */ 984 copy->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 985 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 986 ACL_ENTRY_INHERIT_ONLY); 987 988 /* 989 * 2.G. On the second ACE, if the type is ALLOW, 990 * an implementation MAY clear the following 991 * mask bits: ACL_WRITE_ACL, ACL_WRITE_OWNER. 992 */ 993 if (copy->ae_entry_type == ACL_ENTRY_TYPE_ALLOW) 994 copy->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER); 995 996 /* 997 * Increment the counter to skip the copied entry. 998 */ 999 i++; 1000 } 1001 1002 /* 1003 * 3. To ensure that the mode is honored, apply the algorithm describe 1004 * in Section 2.16.6.3, using the mode that is to be used for file 1005 * creation. 1006 */ 1007 acl_nfs4_sync_acl_from_mode(child_aclp, mode, file_owner_id); 1008 } 1009 #endif /* _KERNEL */ 1010 1011 /* 1012 * Populate the ACL with entries inherited from parent_aclp. 1013 */ 1014 static void 1015 acl_nfs4_inherit_entries(const struct acl *parent_aclp, 1016 struct acl *child_aclp, mode_t mode, int file_owner_id, 1017 int is_directory) 1018 { 1019 int i, flags, tag; 1020 const struct acl_entry *parent_entry; 1021 struct acl_entry *entry; 1022 1023 KASSERT(parent_aclp->acl_cnt <= ACL_MAX_ENTRIES, 1024 ("parent_aclp->acl_cnt <= ACL_MAX_ENTRIES")); 1025 1026 for (i = 0; i < parent_aclp->acl_cnt; i++) { 1027 parent_entry = &(parent_aclp->acl_entry[i]); 1028 flags = parent_entry->ae_flags; 1029 tag = parent_entry->ae_tag; 1030 1031 /* 1032 * Don't inherit owner@, group@, or everyone@ entries. 1033 */ 1034 if (tag == ACL_USER_OBJ || tag == ACL_GROUP_OBJ || 1035 tag == ACL_EVERYONE) 1036 continue; 1037 1038 /* 1039 * Entry is not inheritable at all. 1040 */ 1041 if ((flags & (ACL_ENTRY_DIRECTORY_INHERIT | 1042 ACL_ENTRY_FILE_INHERIT)) == 0) 1043 continue; 1044 1045 /* 1046 * We're creating a file, but entry is not inheritable 1047 * by files. 1048 */ 1049 if (!is_directory && (flags & ACL_ENTRY_FILE_INHERIT) == 0) 1050 continue; 1051 1052 /* 1053 * Entry is inheritable only by files, but has NO_PROPAGATE 1054 * flag set, and we're creating a directory, so it wouldn't 1055 * propagate to any file in that directory anyway. 1056 */ 1057 if (is_directory && 1058 (flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0 && 1059 (flags & ACL_ENTRY_NO_PROPAGATE_INHERIT)) 1060 continue; 1061 1062 /* 1063 * Entry qualifies for being inherited. 1064 */ 1065 KASSERT(child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES, 1066 ("child_aclp->acl_cnt + 1 <= ACL_MAX_ENTRIES")); 1067 entry = &(child_aclp->acl_entry[child_aclp->acl_cnt]); 1068 *entry = *parent_entry; 1069 child_aclp->acl_cnt++; 1070 1071 entry->ae_flags &= ~ACL_ENTRY_INHERIT_ONLY; 1072 entry->ae_flags |= ACL_ENTRY_INHERITED; 1073 1074 /* 1075 * If the type of the ACE is neither ALLOW nor DENY, 1076 * then leave it as it is and proceed to the next one. 1077 */ 1078 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1079 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1080 continue; 1081 1082 /* 1083 * If the ACL_ENTRY_NO_PROPAGATE_INHERIT is set, or if 1084 * the object being created is not a directory, then clear 1085 * the following flags: ACL_ENTRY_NO_PROPAGATE_INHERIT, 1086 * ACL_ENTRY_FILE_INHERIT, ACL_ENTRY_DIRECTORY_INHERIT, 1087 * ACL_ENTRY_INHERIT_ONLY. 1088 */ 1089 if (entry->ae_flags & ACL_ENTRY_NO_PROPAGATE_INHERIT || 1090 !is_directory) { 1091 entry->ae_flags &= ~(ACL_ENTRY_NO_PROPAGATE_INHERIT | 1092 ACL_ENTRY_FILE_INHERIT | ACL_ENTRY_DIRECTORY_INHERIT | 1093 ACL_ENTRY_INHERIT_ONLY); 1094 } 1095 1096 /* 1097 * If the object is a directory and ACL_ENTRY_FILE_INHERIT 1098 * is set, but ACL_ENTRY_DIRECTORY_INHERIT is not set, ensure 1099 * that ACL_ENTRY_INHERIT_ONLY is set. 1100 */ 1101 if (is_directory && 1102 (entry->ae_flags & ACL_ENTRY_FILE_INHERIT) && 1103 ((entry->ae_flags & ACL_ENTRY_DIRECTORY_INHERIT) == 0)) { 1104 entry->ae_flags |= ACL_ENTRY_INHERIT_ONLY; 1105 } 1106 1107 if (entry->ae_entry_type == ACL_ENTRY_TYPE_ALLOW && 1108 (entry->ae_flags & ACL_ENTRY_INHERIT_ONLY) == 0) { 1109 /* 1110 * Some permissions must never be inherited. 1111 */ 1112 entry->ae_perm &= ~(ACL_WRITE_ACL | ACL_WRITE_OWNER | 1113 ACL_WRITE_NAMED_ATTRS | ACL_WRITE_ATTRIBUTES); 1114 1115 /* 1116 * Others must be masked according to the file mode. 1117 */ 1118 if ((mode & S_IRGRP) == 0) 1119 entry->ae_perm &= ~ACL_READ_DATA; 1120 if ((mode & S_IWGRP) == 0) 1121 entry->ae_perm &= 1122 ~(ACL_WRITE_DATA | ACL_APPEND_DATA); 1123 if ((mode & S_IXGRP) == 0) 1124 entry->ae_perm &= ~ACL_EXECUTE; 1125 } 1126 } 1127 } 1128 1129 /* 1130 * Calculate inherited ACL in a manner compatible with PSARC/2010/029. 1131 * It's also being used to calculate a trivial ACL, by inheriting from 1132 * a NULL ACL. 1133 */ 1134 static void 1135 acl_nfs4_compute_inherited_acl_psarc(const struct acl *parent_aclp, 1136 struct acl *aclp, mode_t mode, int file_owner_id, int is_directory) 1137 { 1138 acl_perm_t user_allow_first = 0, user_deny = 0, group_deny = 0; 1139 acl_perm_t user_allow, group_allow, everyone_allow; 1140 1141 KASSERT(aclp->acl_cnt == 0, ("aclp->acl_cnt == 0")); 1142 1143 user_allow = group_allow = everyone_allow = ACL_READ_ACL | 1144 ACL_READ_ATTRIBUTES | ACL_READ_NAMED_ATTRS | ACL_SYNCHRONIZE; 1145 user_allow |= ACL_WRITE_ACL | ACL_WRITE_OWNER | ACL_WRITE_ATTRIBUTES | 1146 ACL_WRITE_NAMED_ATTRS; 1147 1148 if (mode & S_IRUSR) 1149 user_allow |= ACL_READ_DATA; 1150 if (mode & S_IWUSR) 1151 user_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1152 if (mode & S_IXUSR) 1153 user_allow |= ACL_EXECUTE; 1154 1155 if (mode & S_IRGRP) 1156 group_allow |= ACL_READ_DATA; 1157 if (mode & S_IWGRP) 1158 group_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1159 if (mode & S_IXGRP) 1160 group_allow |= ACL_EXECUTE; 1161 1162 if (mode & S_IROTH) 1163 everyone_allow |= ACL_READ_DATA; 1164 if (mode & S_IWOTH) 1165 everyone_allow |= (ACL_WRITE_DATA | ACL_APPEND_DATA); 1166 if (mode & S_IXOTH) 1167 everyone_allow |= ACL_EXECUTE; 1168 1169 user_deny = ((group_allow | everyone_allow) & ~user_allow); 1170 group_deny = everyone_allow & ~group_allow; 1171 user_allow_first = group_deny & ~user_deny; 1172 1173 if (user_allow_first != 0) 1174 _acl_append(aclp, ACL_USER_OBJ, user_allow_first, 1175 ACL_ENTRY_TYPE_ALLOW); 1176 if (user_deny != 0) 1177 _acl_append(aclp, ACL_USER_OBJ, user_deny, 1178 ACL_ENTRY_TYPE_DENY); 1179 if (group_deny != 0) 1180 _acl_append(aclp, ACL_GROUP_OBJ, group_deny, 1181 ACL_ENTRY_TYPE_DENY); 1182 1183 if (parent_aclp != NULL) 1184 acl_nfs4_inherit_entries(parent_aclp, aclp, mode, 1185 file_owner_id, is_directory); 1186 1187 _acl_append(aclp, ACL_USER_OBJ, user_allow, ACL_ENTRY_TYPE_ALLOW); 1188 _acl_append(aclp, ACL_GROUP_OBJ, group_allow, ACL_ENTRY_TYPE_ALLOW); 1189 _acl_append(aclp, ACL_EVERYONE, everyone_allow, ACL_ENTRY_TYPE_ALLOW); 1190 } 1191 1192 #ifdef _KERNEL 1193 void 1194 acl_nfs4_compute_inherited_acl(const struct acl *parent_aclp, 1195 struct acl *child_aclp, mode_t mode, int file_owner_id, 1196 int is_directory) 1197 { 1198 1199 if (acl_nfs4_old_semantics) 1200 acl_nfs4_compute_inherited_acl_draft(parent_aclp, child_aclp, 1201 mode, file_owner_id, is_directory); 1202 else 1203 acl_nfs4_compute_inherited_acl_psarc(parent_aclp, child_aclp, 1204 mode, file_owner_id, is_directory); 1205 } 1206 #endif /* _KERNEL */ 1207 1208 /* 1209 * Calculate trivial ACL in a manner compatible with PSARC/2010/029. 1210 * Note that this results in an ACL different from (but semantically 1211 * equal to) the "canonical six" trivial ACL computed using algorithm 1212 * described in draft-ietf-nfsv4-minorversion1-03.txt, 3.16.6.2. 1213 */ 1214 static void 1215 acl_nfs4_trivial_from_mode(struct acl *aclp, mode_t mode) 1216 { 1217 1218 aclp->acl_cnt = 0; 1219 acl_nfs4_compute_inherited_acl_psarc(NULL, aclp, mode, -1, -1); 1220 } 1221 1222 #ifndef _KERNEL 1223 /* 1224 * This routine is used by libc to implement acl_strip_np(3) 1225 * and acl_is_trivial_np(3). 1226 */ 1227 void 1228 acl_nfs4_trivial_from_mode_libc(struct acl *aclp, int mode, int canonical_six) 1229 { 1230 1231 aclp->acl_cnt = 0; 1232 if (canonical_six) 1233 acl_nfs4_sync_acl_from_mode_draft(aclp, mode, -1); 1234 else 1235 acl_nfs4_trivial_from_mode(aclp, mode); 1236 } 1237 #endif /* !_KERNEL */ 1238 1239 #ifdef _KERNEL 1240 static int 1241 _acls_are_equal(const struct acl *a, const struct acl *b) 1242 { 1243 int i; 1244 const struct acl_entry *entrya, *entryb; 1245 1246 if (a->acl_cnt != b->acl_cnt) 1247 return (0); 1248 1249 for (i = 0; i < b->acl_cnt; i++) { 1250 entrya = &(a->acl_entry[i]); 1251 entryb = &(b->acl_entry[i]); 1252 1253 if (entrya->ae_tag != entryb->ae_tag || 1254 entrya->ae_id != entryb->ae_id || 1255 entrya->ae_perm != entryb->ae_perm || 1256 entrya->ae_entry_type != entryb->ae_entry_type || 1257 entrya->ae_flags != entryb->ae_flags) 1258 return (0); 1259 } 1260 1261 return (1); 1262 } 1263 1264 /* 1265 * This routine is used to determine whether to remove extended attribute 1266 * that stores ACL contents. 1267 */ 1268 int 1269 acl_nfs4_is_trivial(const struct acl *aclp, int file_owner_id) 1270 { 1271 int trivial; 1272 mode_t tmpmode = 0; 1273 struct acl *tmpaclp; 1274 1275 if (aclp->acl_cnt > 6) 1276 return (0); 1277 1278 /* 1279 * Compute the mode from the ACL, then compute new ACL from that mode. 1280 * If the ACLs are identical, then the ACL is trivial. 1281 * 1282 * XXX: I guess there is a faster way to do this. However, even 1283 * this slow implementation significantly speeds things up 1284 * for files that don't have non-trivial ACLs - it's critical 1285 * for performance to not use EA when they are not needed. 1286 * 1287 * First try the PSARC/2010/029 semantics. 1288 */ 1289 tmpaclp = acl_alloc(M_WAITOK | M_ZERO); 1290 acl_nfs4_sync_mode_from_acl(&tmpmode, aclp); 1291 acl_nfs4_trivial_from_mode(tmpaclp, tmpmode); 1292 trivial = _acls_are_equal(aclp, tmpaclp); 1293 if (trivial) { 1294 acl_free(tmpaclp); 1295 return (trivial); 1296 } 1297 1298 /* 1299 * Check if it's a draft-ietf-nfsv4-minorversion1-03.txt trivial ACL. 1300 */ 1301 tmpaclp->acl_cnt = 0; 1302 acl_nfs4_sync_acl_from_mode_draft(tmpaclp, tmpmode, file_owner_id); 1303 trivial = _acls_are_equal(aclp, tmpaclp); 1304 acl_free(tmpaclp); 1305 1306 return (trivial); 1307 } 1308 #endif /* _KERNEL */ 1309 1310 int 1311 acl_nfs4_check(const struct acl *aclp, int is_directory) 1312 { 1313 int i; 1314 const struct acl_entry *entry; 1315 1316 /* 1317 * The spec doesn't seem to say anything about ACL validity. 1318 * It seems there is not much to do here. There is even no need 1319 * to count "owner@" or "everyone@" (ACL_USER_OBJ and ACL_EVERYONE) 1320 * entries, as there can be several of them and that's perfectly 1321 * valid. There can be none of them too. Really. 1322 */ 1323 1324 if (aclp->acl_cnt > ACL_MAX_ENTRIES || aclp->acl_cnt <= 0) 1325 return (EINVAL); 1326 1327 for (i = 0; i < aclp->acl_cnt; i++) { 1328 entry = &(aclp->acl_entry[i]); 1329 1330 switch (entry->ae_tag) { 1331 case ACL_USER_OBJ: 1332 case ACL_GROUP_OBJ: 1333 case ACL_EVERYONE: 1334 if (entry->ae_id != ACL_UNDEFINED_ID) 1335 return (EINVAL); 1336 break; 1337 1338 case ACL_USER: 1339 case ACL_GROUP: 1340 if (entry->ae_id == ACL_UNDEFINED_ID) 1341 return (EINVAL); 1342 break; 1343 1344 default: 1345 return (EINVAL); 1346 } 1347 1348 if ((entry->ae_perm | ACL_NFS4_PERM_BITS) != ACL_NFS4_PERM_BITS) 1349 return (EINVAL); 1350 1351 /* 1352 * Disallow ACL_ENTRY_TYPE_AUDIT and ACL_ENTRY_TYPE_ALARM for now. 1353 */ 1354 if (entry->ae_entry_type != ACL_ENTRY_TYPE_ALLOW && 1355 entry->ae_entry_type != ACL_ENTRY_TYPE_DENY) 1356 return (EINVAL); 1357 1358 if ((entry->ae_flags | ACL_FLAGS_BITS) != ACL_FLAGS_BITS) 1359 return (EINVAL); 1360 1361 /* Disallow unimplemented flags. */ 1362 if (entry->ae_flags & (ACL_ENTRY_SUCCESSFUL_ACCESS | 1363 ACL_ENTRY_FAILED_ACCESS)) 1364 return (EINVAL); 1365 1366 /* Disallow flags not allowed for ordinary files. */ 1367 if (!is_directory) { 1368 if (entry->ae_flags & (ACL_ENTRY_FILE_INHERIT | 1369 ACL_ENTRY_DIRECTORY_INHERIT | 1370 ACL_ENTRY_NO_PROPAGATE_INHERIT | ACL_ENTRY_INHERIT_ONLY)) 1371 return (EINVAL); 1372 } 1373 } 1374 1375 return (0); 1376 } 1377 1378 #ifdef _KERNEL 1379 static int 1380 acl_nfs4_modload(module_t module, int what, void *arg) 1381 { 1382 int ret; 1383 1384 ret = 0; 1385 1386 switch (what) { 1387 case MOD_LOAD: 1388 case MOD_SHUTDOWN: 1389 break; 1390 1391 case MOD_QUIESCE: 1392 /* XXX TODO */ 1393 ret = 0; 1394 break; 1395 1396 case MOD_UNLOAD: 1397 /* XXX TODO */ 1398 ret = 0; 1399 break; 1400 default: 1401 ret = EINVAL; 1402 break; 1403 } 1404 1405 return (ret); 1406 } 1407 1408 static moduledata_t acl_nfs4_mod = { 1409 "acl_nfs4", 1410 acl_nfs4_modload, 1411 NULL 1412 }; 1413 1414 /* 1415 * XXX TODO: which subsystem, order? 1416 */ 1417 DECLARE_MODULE(acl_nfs4, acl_nfs4_mod, SI_SUB_VFS, SI_ORDER_FIRST); 1418 MODULE_VERSION(acl_nfs4, 1); 1419 #endif /* _KERNEL */ 1420